[thirdparty/mdadm.git] / raid6check.c

/*
 * raid6check - extended consistency check for RAID-6
 *
 * Copyright (C) 2011 Piergiorgio Sartor
 *
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *    Author: Piergiorgio Sartor
 *    Based on "restripe.c" from "mdadm" codebase
 */

#include "mdadm.h"
#include <stdint.h>
#include <signal.h>
#include <sys/mman.h>

int geo_map(int block, unsigned long long stripe, int raid_disks,
	    int level, int layout);
void qsyndrome(uint8_t *p, uint8_t *q, uint8_t **sources, int disks, int size);
void make_tables(void);
void ensure_zero_has_size(int chunk_size);
void raid6_datap_recov(int disks, size_t bytes, int faila, uint8_t **ptrs);
void raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
		       uint8_t **ptrs);
void xor_blocks(char *target, char **sources, int disks, int size);


/* Collect per stripe consistency information */
void raid6_collect(int chunk_size, uint8_t *p, uint8_t *q,
		   char *chunkP, char *chunkQ, int *results)
{
	int i;
	int data_id;
	uint8_t Px, Qx;
	extern uint8_t raid6_gflog[];

	for(i = 0; i < chunk_size; i++) {
		Px = (uint8_t)chunkP[i] ^ (uint8_t)p[i];
		Qx = (uint8_t)chunkQ[i] ^ (uint8_t)q[i];

		if((Px != 0) && (Qx == 0))
			results[i] = -1;

		if((Px == 0) && (Qx != 0))
			results[i] = -2;

		if((Px != 0) && (Qx != 0)) {
			data_id = (raid6_gflog[Qx] - raid6_gflog[Px]);
			if(data_id < 0) data_id += 255;
			results[i] = data_id;
		}

		if((Px == 0) && (Qx == 0))
			results[i] = -255;
	}
}

/* Try to find out if a specific disk has problems */
int raid6_stats(int *results, int raid_disks, int chunk_size)
{
	int i;
	int curr_broken_disk = -255;
	int prev_broken_disk = -255;
	int broken_status = 0;

	for(i = 0; i < chunk_size; i++) {

		if(results[i] != -255)
			curr_broken_disk = results[i];

		if(curr_broken_disk >= raid_disks)
			broken_status = 2;

		switch(broken_status) {
		case 0:
			if(curr_broken_disk != -255) {
				prev_broken_disk = curr_broken_disk;
				broken_status = 1;
			}
			break;

		case 1:
			if(curr_broken_disk != prev_broken_disk)
				broken_status = 2;
			break;

		case 2:
		default:
			curr_broken_disk = prev_broken_disk = -65535;
			break;
		}
	}

	return curr_broken_disk;
}

int check_stripes(struct mdinfo *info, int *source, unsigned long long *offsets,
		  int raid_disks, int chunk_size, int level, int layout,
		  unsigned long long start, unsigned long long length, char *name[],
		  int repair, int failed_disk1, int failed_disk2)
{
	/* read the data and p and q blocks, and check we got them right */
	char *stripe_buf = xmalloc(raid_disks * chunk_size);
	char **stripes = xmalloc(raid_disks * sizeof(char*));
	char **blocks = xmalloc(raid_disks * sizeof(char*));
	uint8_t *p = xmalloc(chunk_size);
	uint8_t *q = xmalloc(chunk_size);
	int *results = xmalloc(chunk_size * sizeof(int));

	int i;
	int diskP, diskQ;
	int data_disks = raid_disks - 2;
	int err = 0;
	sighandler_t sig[3];
	int rv;

	extern int tables_ready;

	if (!tables_ready)
		make_tables();

	for ( i = 0 ; i < raid_disks ; i++)
		stripes[i] = stripe_buf + i * chunk_size;

	while (length > 0) {
		int disk;

		printf("pos --> %llu\n", start);

		if(mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
			err = 2;
			goto exitCheck;
		}
		sig[0] = signal(SIGTERM, SIG_IGN);
		sig[1] = signal(SIGINT, SIG_IGN);
		sig[2] = signal(SIGQUIT, SIG_IGN);
		rv = sysfs_set_num(info, NULL, "suspend_lo", start * chunk_size * data_disks);
		rv |= sysfs_set_num(info, NULL, "suspend_hi", (start + 1) * chunk_size * data_disks);
		for (i = 0 ; i < raid_disks ; i++) {
			lseek64(source[i], offsets[i] + start * chunk_size, 0);
			read(source[i], stripes[i], chunk_size);
		}
		rv |= sysfs_set_num(info, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
		rv |= sysfs_set_num(info, NULL, "suspend_hi", 0);
		rv |= sysfs_set_num(info, NULL, "suspend_lo", 0);
		signal(SIGQUIT, sig[2]);
		signal(SIGINT, sig[1]);
		signal(SIGTERM, sig[0]);
		if(munlockall() != 0) {
			err = 3;
			goto exitCheck;
		}

		if(rv != 0) {
			err = rv * 256;
			goto exitCheck;
		}

		for (i = 0 ; i < data_disks ; i++) {
			int disk = geo_map(i, start, raid_disks, level, layout);
			blocks[i] = stripes[disk];
			printf("%d->%d\n", i, disk);
		}

		qsyndrome(p, q, (uint8_t**)blocks, data_disks, chunk_size);
		diskP = geo_map(-1, start, raid_disks, level, layout);
		diskQ = geo_map(-2, start, raid_disks, level, layout);
		blocks[data_disks] = stripes[diskP];
		blocks[data_disks+1] = stripes[diskQ];

		if (memcmp(p, stripes[diskP], chunk_size) != 0) {
			printf("P(%d) wrong at %llu\n", diskP, start);
		}
		if (memcmp(q, stripes[diskQ], chunk_size) != 0) {
			printf("Q(%d) wrong at %llu\n", diskQ, start);
		}
		raid6_collect(chunk_size, p, q, stripes[diskP], stripes[diskQ], results);
		disk = raid6_stats(results, raid_disks, chunk_size);

		if(disk >= -2) {
			disk = geo_map(disk, start, raid_disks, level, layout);
		}
		if(disk >= 0) {
			printf("Error detected at %llu: possible failed disk slot: %d --> %s\n",
				start, disk, name[disk]);
		}
		if(disk == -65535) {
			printf("Error detected at %llu: disk slot unknown\n", start);
		}
		if(repair == 1) {
			printf("Repairing stripe %llu\n", start);
			printf("Assuming slots %d (%s) and %d (%s) are incorrect\n",
			       failed_disk1, name[failed_disk1],
			       failed_disk2, name[failed_disk2]);

			if (failed_disk1 == diskQ || failed_disk2 == diskQ) {
				char *all_but_failed_blocks[data_disks];
				int failed_data;
				int failed_block_index;

				if (failed_disk1 == diskQ)
					failed_data = failed_disk2;
				else
					failed_data = failed_disk1;
				printf("Repairing D/P(%d) and Q\n", failed_data);
				failed_block_index = geo_map(
					failed_data, start, raid_disks,
					level, layout);
				for (i=0; i < data_disks; i++)
					if (failed_block_index == i)
						all_but_failed_blocks[i] = stripes[diskP];
					else
						all_but_failed_blocks[i] = blocks[i];
				xor_blocks(stripes[failed_data],
					all_but_failed_blocks, data_disks, chunk_size);
				qsyndrome(p, (uint8_t*)stripes[diskQ], (uint8_t**)blocks, data_disks, chunk_size);
			} else {
				ensure_zero_has_size(chunk_size);
				if (failed_disk1 == diskP || failed_disk2 == diskP) {
					int failed_data, failed_block_index;
					if (failed_disk1 == diskP)
						failed_data = failed_disk2;
					else
						failed_data = failed_disk1;
					failed_block_index = geo_map(failed_data, start, raid_disks, level, layout);
					printf("Repairing D(%d) and P\n", failed_data);
					raid6_datap_recov(raid_disks, chunk_size, failed_block_index, (uint8_t**)blocks);
				} else {
					printf("Repairing D and D\n");
					int failed_block_index1 = geo_map(failed_disk1, start, raid_disks, level, layout);
					int failed_block_index2 = geo_map(failed_disk2, start, raid_disks, level, layout);
					if (failed_block_index1 > failed_block_index2) {
						int t = failed_block_index1;
						failed_block_index1 = failed_block_index2;
						failed_block_index2 = t;
					}
					raid6_2data_recov(raid_disks, chunk_size, failed_block_index1, failed_block_index2, (uint8_t**)blocks);
				}
			}
			if(mlockall(MCL_CURRENT | MCL_FUTURE) != 0) {
				err = 2;
				goto exitCheck;
			}
			sig[0] = signal(SIGTERM, SIG_IGN);
			sig[1] = signal(SIGINT, SIG_IGN);
			sig[2] = signal(SIGQUIT, SIG_IGN);
			rv = sysfs_set_num(info, NULL, "suspend_lo", start * chunk_size * data_disks);
			rv |= sysfs_set_num(info, NULL, "suspend_hi", (start + 1) * chunk_size * data_disks);
			lseek64(source[failed_disk1], offsets[failed_disk1] + start * chunk_size, 0);
			write(source[failed_disk1], stripes[failed_disk1], chunk_size);
			lseek64(source[failed_disk2], offsets[failed_disk2] + start * chunk_size, 0);
			write(source[failed_disk2], stripes[failed_disk2], chunk_size);
			rv |= sysfs_set_num(info, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
			rv |= sysfs_set_num(info, NULL, "suspend_hi", 0);
			rv |= sysfs_set_num(info, NULL, "suspend_lo", 0);
			signal(SIGQUIT, sig[2]);
			signal(SIGINT, sig[1]);
			signal(SIGTERM, sig[0]);
			if(munlockall() != 0) {
				err = 3;
				goto exitCheck;
			}

			if(rv != 0) {
				err = rv * 256;
				goto exitCheck;
			}
		}


		length--;
		start++;
	}

exitCheck:

	free(stripe_buf);
	free(stripes);
	free(blocks);
	free(p);
	free(q);
	free(results);

	return err;
}

unsigned long long getnum(char *str, char **err)
{
	char *e;
	unsigned long long rv = strtoull(str, &e, 10);
	if (e==str || *e) {
		*err = str;
		return 0;
	}
	return rv;
}

int main(int argc, char *argv[])
{
	/* md_device start length */
	int *fds = NULL;
	char *buf = NULL;
	char **disk_name = NULL;
	unsigned long long *offsets = NULL;
	int raid_disks = 0;
	int active_disks;
	int chunk_size = 0;
	int layout = -1;
	int level = 6;
	int repair = 0;
	int failed_disk1, failed_disk2;
	unsigned long long start, length;
	int i;
	int mdfd;
	struct mdinfo *info = NULL, *comp = NULL;
	char *err = NULL;
	int exit_err = 0;
	int close_flag = 0;
	char *prg = strrchr(argv[0], '/');

	if (prg == NULL)
		prg = argv[0];
	else
		prg++;

	if (argc < 4) {
		fprintf(stderr, "Usage: %s md_device start_stripe length_stripes\n", prg);
		fprintf(stderr, "   or: %s md_device repair stripe failed_slot_1 failed_slot_2\n", prg);
		exit_err = 1;
		goto exitHere;
	}

	mdfd = open(argv[1], O_RDONLY);
	if(mdfd < 0) {
		perror(argv[1]);
		fprintf(stderr, "%s: cannot open %s\n", prg, argv[1]);
		exit_err = 2;
		goto exitHere;
	}

	info = sysfs_read(mdfd, -1,
			  GET_LEVEL|
			  GET_LAYOUT|
			  GET_DISKS|
			  GET_DEGRADED |
			  GET_COMPONENT|
			  GET_CHUNK|
			  GET_DEVS|
			  GET_OFFSET|
			  GET_SIZE);

	if(info == NULL) {
		fprintf(stderr, "%s: Error reading sysfs information of %s\n", prg, argv[1]);
		exit_err = 9;
		goto exitHere;
	}

	if(info->array.level != level) {
		fprintf(stderr, "%s: %s not a RAID-6\n", prg, argv[1]);
		exit_err = 3;
		goto exitHere;
	}

	if(info->array.failed_disks > 0) {
		fprintf(stderr, "%s: %s degraded array\n", prg, argv[1]);
		exit_err = 8;
		goto exitHere;
	}

	printf("layout: %d\n", info->array.layout);
	printf("disks: %d\n", info->array.raid_disks);
	printf("component size: %llu\n", info->component_size * 512);
	printf("total stripes: %llu\n", (info->component_size * 512) / info->array.chunk_size);
	printf("chunk size: %d\n", info->array.chunk_size);
	printf("\n");

	comp = info->devs;
	for(i = 0, active_disks = 0; active_disks < info->array.raid_disks; i++) {
		printf("disk: %d - offset: %llu - size: %llu - name: %s - slot: %d\n",
			i, comp->data_offset * 512, comp->component_size * 512,
			map_dev(comp->disk.major, comp->disk.minor, 0),
			comp->disk.raid_disk);
		if(comp->disk.raid_disk >= 0)
			active_disks++;
		comp = comp->next;
	}
	printf("\n");

	close(mdfd);

	raid_disks = info->array.raid_disks;
	chunk_size = info->array.chunk_size;
	layout = info->array.layout;
	if (strcmp(argv[2], "repair")==0) {
		if (argc < 6) {
			fprintf(stderr, "For repair mode, call %s md_device repair stripe failed_slot_1 failed_slot_2\n", prg);
			exit_err = 1;
			goto exitHere;
		}
		repair = 1;
		start = getnum(argv[3], &err);
		length = 1;
		failed_disk1 = getnum(argv[4], &err);
		failed_disk2 = getnum(argv[5], &err);

		if(failed_disk1 >= info->array.raid_disks) {
			fprintf(stderr, "%s: failed_slot_1 index is higher than number of devices in raid\n", prg);
			exit_err = 4;
			goto exitHere;
		}
		if(failed_disk2 >= info->array.raid_disks) {
			fprintf(stderr, "%s: failed_slot_2 index is higher than number of devices in raid\n", prg);
			exit_err = 4;
			goto exitHere;
		}
		if(failed_disk1 == failed_disk2) {
			fprintf(stderr, "%s: failed_slot_1 and failed_slot_2 are the same\n", prg);
			exit_err = 4;
			goto exitHere;
		}
	}
	else {
		start = getnum(argv[2], &err);
		length = getnum(argv[3], &err);
	}

	if (err) {
		fprintf(stderr, "%s: Bad number: %s\n", prg, err);
		exit_err = 4;
		goto exitHere;
	}

	if(start > ((info->component_size * 512) / chunk_size)) {
		start = (info->component_size * 512) / chunk_size;
		fprintf(stderr, "%s: start beyond disks size\n", prg);
	}

	if((length == 0) ||
	   ((length + start) > ((info->component_size * 512) / chunk_size))) {
		length = (info->component_size * 512) / chunk_size - start;
	}

	disk_name = xmalloc(raid_disks * sizeof(*disk_name));
	fds = xmalloc(raid_disks * sizeof(*fds));
	offsets = xcalloc(raid_disks, sizeof(*offsets));
	buf = xmalloc(raid_disks * chunk_size);

	for(i=0; i<raid_disks; i++) {
		fds[i] = -1;
	}
	close_flag = 1;

	comp = info->devs;
	for (i=0, active_disks=0; active_disks<raid_disks; i++) {
		int disk_slot = comp->disk.raid_disk;
		if(disk_slot >= 0) {
			disk_name[disk_slot] = map_dev(comp->disk.major, comp->disk.minor, 0);
			offsets[disk_slot] = comp->data_offset * 512;
			fds[disk_slot] = open(disk_name[disk_slot], O_RDWR);
			if (fds[disk_slot] < 0) {
				perror(disk_name[disk_slot]);
				fprintf(stderr,"%s: cannot open %s\n", prg, disk_name[disk_slot]);
				exit_err = 6;
				goto exitHere;
			}
			active_disks++;
		}
		comp = comp->next;
	}

	int rv = check_stripes(info, fds, offsets,
			       raid_disks, chunk_size, level, layout,
			       start, length, disk_name, repair, failed_disk1, failed_disk2);
	if (rv != 0) {
		fprintf(stderr,
			"%s: check_stripes returned %d\n", prg, rv);
		exit_err = 7;
		goto exitHere;
	}

exitHere:

	if (close_flag)
		for(i = 0; i < raid_disks; i++)
			close(fds[i]);

	free(disk_name);
	free(fds);
	free(offsets);
	free(buf);

	exit(exit_err);
}
Commit	Line	Data
979afcb8 PS	1	/*
	2	* raid6check - extended consistency check for RAID-6
	3	*
	4	* Copyright (C) 2011 Piergiorgio Sartor
	5	*
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*
	21	* Author: Piergiorgio Sartor
	22	* Based on "restripe.c" from "mdadm" codebase
	23	*/
	24
	25	#include "mdadm.h"
	26	#include <stdint.h>
8d8ab389 PS	27	#include <signal.h>
8d8ab389 PS	28	#include <sys/mman.h>
979afcb8 PS	29
	30	int geo_map(int block, unsigned long long stripe, int raid_disks,
	31	int level, int layout);
	32	void qsyndrome(uint8_t p, uint8_t q, uint8_t **sources, int disks, int size);
	33	void make_tables(void);
f2e29ad6 RB	34	void ensure_zero_has_size(int chunk_size);
	35	void raid6_datap_recov(int disks, size_t bytes, int faila, uint8_t **ptrs);
	36	void raid6_2data_recov(int disks, size_t bytes, int faila, int failb,
	37	uint8_t **ptrs);
	38	void xor_blocks(char target, char *sources, int disks, int size);
	39
979afcb8 PS	40
	41	/* Collect per stripe consistency information */
	42	void raid6_collect(int chunk_size, uint8_t p, uint8_t q,
	43	char chunkP, char chunkQ, int *results)
	44	{
	45	int i;
	46	int data_id;
	47	uint8_t Px, Qx;
	48	extern uint8_t raid6_gflog[];
	49
	50	for(i = 0; i < chunk_size; i++) {
	51	Px = (uint8_t)chunkP[i] ^ (uint8_t)p[i];
	52	Qx = (uint8_t)chunkQ[i] ^ (uint8_t)q[i];
	53
	54	if((Px != 0) && (Qx == 0))
	55	results[i] = -1;
	56
	57	if((Px == 0) && (Qx != 0))
	58	results[i] = -2;
	59
	60	if((Px != 0) && (Qx != 0)) {
	61	data_id = (raid6_gflog[Qx] - raid6_gflog[Px]);
	62	if(data_id < 0) data_id += 255;
	63	results[i] = data_id;
	64	}
	65
	66	if((Px == 0) && (Qx == 0))
	67	results[i] = -255;
	68	}
	69	}
	70
	71	/* Try to find out if a specific disk has problems */
	72	int raid6_stats(int *results, int raid_disks, int chunk_size)
	73	{
	74	int i;
	75	int curr_broken_disk = -255;
	76	int prev_broken_disk = -255;
	77	int broken_status = 0;
	78
	79	for(i = 0; i < chunk_size; i++) {
	80
	81	if(results[i] != -255)
	82	curr_broken_disk = results[i];
	83
	84	if(curr_broken_disk >= raid_disks)
	85	broken_status = 2;
	86
	87	switch(broken_status) {
	88	case 0:
	89	if(curr_broken_disk != -255) {
	90	prev_broken_disk = curr_broken_disk;
	91	broken_status = 1;
	92	}
	93	break;
	94
	95	case 1:
	96	if(curr_broken_disk != prev_broken_disk)
	97	broken_status = 2;
	98	break;
	99
	100	case 2:
	101	default:
	102	curr_broken_disk = prev_broken_disk = -65535;
	103	break;
104	}
105	}
106
107	return curr_broken_disk;
108	}
109
8d8ab389	110	int check_stripes(struct mdinfo info, int source, unsigned long long *offsets,
979afcb8	111	int raid_disks, int chunk_size, int level, int layout,
f2e29ad6 RB	112	unsigned long long start, unsigned long long length, char *name[],
f2e29ad6 RB	113	int repair, int failed_disk1, int failed_disk2)
979afcb8 PS	114	{
979afcb8 PS	115	/* read the data and p and q blocks, and check we got them right */
503975b9 N	116	char stripe_buf = xmalloc(raid_disks chunk_size);
	117	char *stripes = xmalloc(raid_disks sizeof(char*));
	118	char *blocks = xmalloc(raid_disks sizeof(char*));
	119	uint8_t *p = xmalloc(chunk_size);
	120	uint8_t *q = xmalloc(chunk_size);
	121	int results = xmalloc(chunk_size sizeof(int));
979afcb8 PS	122
	123	int i;
	124	int diskP, diskQ;
	125	int data_disks = raid_disks - 2;
af3c3750	126	int err = 0;
8d8ab389 PS	127	sighandler_t sig[3];
8d8ab389 PS	128	int rv;
979afcb8 PS	129
	130	extern int tables_ready;
	131
	132	if (!tables_ready)
	133	make_tables();
	134
	135	for ( i = 0 ; i < raid_disks ; i++)
	136	stripes[i] = stripe_buf + i * chunk_size;
	137
	138	while (length > 0) {
	139	int disk;
	140
af3c3750 PS	141	printf("pos --> %llu\n", start);
af3c3750 PS	142
8d8ab389 PS	143	if(mlockall(MCL_CURRENT \| MCL_FUTURE) != 0) {
	144	err = 2;
	145	goto exitCheck;
	146	}
	147	sig[0] = signal(SIGTERM, SIG_IGN);
	148	sig[1] = signal(SIGINT, SIG_IGN);
	149	sig[2] = signal(SIGQUIT, SIG_IGN);
	150	rv = sysfs_set_num(info, NULL, "suspend_lo", start * chunk_size * data_disks);
	151	rv \|= sysfs_set_num(info, NULL, "suspend_hi", (start + 1) * chunk_size * data_disks);
979afcb8	152	for (i = 0 ; i < raid_disks ; i++) {
af3c3750	153	lseek64(source[i], offsets[i] + start * chunk_size, 0);
979afcb8 PS	154	read(source[i], stripes[i], chunk_size);
979afcb8 PS	155	}
8d8ab389 PS	156	rv \|= sysfs_set_num(info, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
	157	rv \|= sysfs_set_num(info, NULL, "suspend_hi", 0);
	158	rv \|= sysfs_set_num(info, NULL, "suspend_lo", 0);
	159	signal(SIGQUIT, sig[2]);
	160	signal(SIGINT, sig[1]);
	161	signal(SIGTERM, sig[0]);
	162	if(munlockall() != 0) {
	163	err = 3;
	164	goto exitCheck;
	165	}
	166
	167	if(rv != 0) {
	168	err = rv * 256;
	169	goto exitCheck;
	170	}
	171
979afcb8	172	for (i = 0 ; i < data_disks ; i++) {
af3c3750	173	int disk = geo_map(i, start, raid_disks, level, layout);
979afcb8 PS	174	blocks[i] = stripes[disk];
	175	printf("%d->%d\n", i, disk);
	176	}
	177
	178	qsyndrome(p, q, (uint8_t**)blocks, data_disks, chunk_size);
af3c3750	179	diskP = geo_map(-1, start, raid_disks, level, layout);
f2e29ad6 RB	180	diskQ = geo_map(-2, start, raid_disks, level, layout);
	181	blocks[data_disks] = stripes[diskP];
	182	blocks[data_disks+1] = stripes[diskQ];
	183
979afcb8	184	if (memcmp(p, stripes[diskP], chunk_size) != 0) {
af3c3750	185	printf("P(%d) wrong at %llu\n", diskP, start);
979afcb8	186	}
979afcb8	187	if (memcmp(q, stripes[diskQ], chunk_size) != 0) {
af3c3750	188	printf("Q(%d) wrong at %llu\n", diskQ, start);
979afcb8	189	}
af3c3750	190	raid6_collect(chunk_size, p, q, stripes[diskP], stripes[diskQ], results);
979afcb8 PS	191	disk = raid6_stats(results, raid_disks, chunk_size);
	192
	193	if(disk >= -2) {
af3c3750	194	disk = geo_map(disk, start, raid_disks, level, layout);
979afcb8 PS	195	}
979afcb8 PS	196	if(disk >= 0) {
af3c3750 PS	197	printf("Error detected at %llu: possible failed disk slot: %d --> %s\n",
af3c3750 PS	198	start, disk, name[disk]);
979afcb8 PS	199	}
979afcb8 PS	200	if(disk == -65535) {
af3c3750	201	printf("Error detected at %llu: disk slot unknown\n", start);
979afcb8	202	}
f2e29ad6 RB	203	if(repair == 1) {
	204	printf("Repairing stripe %llu\n", start);
	205	printf("Assuming slots %d (%s) and %d (%s) are incorrect\n",
	206	failed_disk1, name[failed_disk1],
	207	failed_disk2, name[failed_disk2]);
	208
	209	if (failed_disk1 == diskQ \|\| failed_disk2 == diskQ) {
	210	char *all_but_failed_blocks[data_disks];
	211	int failed_data;
	212	int failed_block_index;
	213
	214	if (failed_disk1 == diskQ)
	215	failed_data = failed_disk2;
	216	else
	217	failed_data = failed_disk1;
	218	printf("Repairing D/P(%d) and Q\n", failed_data);
	219	failed_block_index = geo_map(
	220	failed_data, start, raid_disks,
	221	level, layout);
	222	for (i=0; i < data_disks; i++)
	223	if (failed_block_index == i)
	224	all_but_failed_blocks[i] = stripes[diskP];
	225	else
	226	all_but_failed_blocks[i] = blocks[i];
	227	xor_blocks(stripes[failed_data],
	228	all_but_failed_blocks, data_disks, chunk_size);
	229	qsyndrome(p, (uint8_t)stripes[diskQ], (uint8_t*)blocks, data_disks, chunk_size);
	230	} else {
	231	ensure_zero_has_size(chunk_size);
	232	if (failed_disk1 == diskP \|\| failed_disk2 == diskP) {
	233	int failed_data, failed_block_index;
	234	if (failed_disk1 == diskP)
	235	failed_data = failed_disk2;
	236	else
	237	failed_data = failed_disk1;
	238	failed_block_index = geo_map(failed_data, start, raid_disks, level, layout);
	239	printf("Repairing D(%d) and P\n", failed_data);
	240	raid6_datap_recov(raid_disks, chunk_size, failed_block_index, (uint8_t**)blocks);
	241	} else {
	242	printf("Repairing D and D\n");
	243	int failed_block_index1 = geo_map(failed_disk1, start, raid_disks, level, layout);
	244	int failed_block_index2 = geo_map(failed_disk2, start, raid_disks, level, layout);
	245	if (failed_block_index1 > failed_block_index2) {
	246	int t = failed_block_index1;
	247	failed_block_index1 = failed_block_index2;
	248	failed_block_index2 = t;
	249	}
	250	raid6_2data_recov(raid_disks, chunk_size, failed_block_index1, failed_block_index2, (uint8_t**)blocks);
	251	}
	252	}
	253	if(mlockall(MCL_CURRENT \| MCL_FUTURE) != 0) {
	254	err = 2;
	255	goto exitCheck;
	256	}
	257	sig[0] = signal(SIGTERM, SIG_IGN);
	258	sig[1] = signal(SIGINT, SIG_IGN);
	259	sig[2] = signal(SIGQUIT, SIG_IGN);
	260	rv = sysfs_set_num(info, NULL, "suspend_lo", start * chunk_size * data_disks);
	261	rv \|= sysfs_set_num(info, NULL, "suspend_hi", (start + 1) * chunk_size * data_disks);
	262	lseek64(source[failed_disk1], offsets[failed_disk1] + start * chunk_size, 0);
	263	write(source[failed_disk1], stripes[failed_disk1], chunk_size);
	264	lseek64(source[failed_disk2], offsets[failed_disk2] + start * chunk_size, 0);
	265	write(source[failed_disk2], stripes[failed_disk2], chunk_size);
	266	rv \|= sysfs_set_num(info, NULL, "suspend_lo", 0x7FFFFFFFFFFFFFFFULL);
267	rv \|= sysfs_set_num(info, NULL, "suspend_hi", 0);
268	rv \|= sysfs_set_num(info, NULL, "suspend_lo", 0);
269	signal(SIGQUIT, sig[2]);
270	signal(SIGINT, sig[1]);
271	signal(SIGTERM, sig[0]);
272	if(munlockall() != 0) {
273	err = 3;
274	goto exitCheck;
275	}
276
277	if(rv != 0) {
278	err = rv * 256;
279	goto exitCheck;
280	}
281	}
282
979afcb8	283
af3c3750 PS	284	length--;
af3c3750 PS	285	start++;
979afcb8 PS	286	}
979afcb8 PS	287
af3c3750 PS	288	exitCheck:
af3c3750 PS	289
979afcb8 PS	290	free(stripe_buf);
	291	free(stripes);
	292	free(blocks);
	293	free(p);
	294	free(q);
	295	free(results);
	296
af3c3750	297	return err;
979afcb8 PS	298	}
	299
	300	unsigned long long getnum(char str, char *err)
	301	{
	302	char *e;
	303	unsigned long long rv = strtoull(str, &e, 10);
	304	if (e==str \|\| *e) {
	305	*err = str;
	306	return 0;
	307	}
	308	return rv;
	309	}
	310
	311	int main(int argc, char *argv[])
	312	{
a9c2c6c6	313	/* md_device start length */
af3c3750 PS	314	int *fds = NULL;
	315	char *buf = NULL;
	316	char **disk_name = NULL;
	317	unsigned long long *offsets = NULL;
	318	int raid_disks = 0;
2cf31121	319	int active_disks;
af3c3750 PS	320	int chunk_size = 0;
af3c3750 PS	321	int layout = -1;
979afcb8	322	int level = 6;
f2e29ad6 RB	323	int repair = 0;
f2e29ad6 RB	324	int failed_disk1, failed_disk2;
979afcb8 PS	325	unsigned long long start, length;
979afcb8 PS	326	int i;
a9c2c6c6	327	int mdfd;
8d8ab389	328	struct mdinfo info = NULL, comp = NULL;
979afcb8	329	char *err = NULL;
af3c3750 PS	330	int exit_err = 0;
	331	int close_flag = 0;
	332	char *prg = strrchr(argv[0], '/');
	333
	334	if (prg == NULL)
	335	prg = argv[0];
	336	else
	337	prg++;
	338
	339	if (argc < 4) {
	340	fprintf(stderr, "Usage: %s md_device start_stripe length_stripes\n", prg);
f2e29ad6	341	fprintf(stderr, " or: %s md_device repair stripe failed_slot_1 failed_slot_2\n", prg);
af3c3750 PS	342	exit_err = 1;
af3c3750 PS	343	goto exitHere;
979afcb8 PS	344	}
979afcb8 PS	345
a9c2c6c6 PS	346	mdfd = open(argv[1], O_RDONLY);
	347	if(mdfd < 0) {
	348	perror(argv[1]);
e7b84f9d	349	fprintf(stderr, "%s: cannot open %s\n", prg, argv[1]);
af3c3750 PS	350	exit_err = 2;
af3c3750 PS	351	goto exitHere;
a9c2c6c6 PS	352	}
	353
	354	info = sysfs_read(mdfd, -1,
	355	GET_LEVEL\|
	356	GET_LAYOUT\|
	357	GET_DISKS\|
2cf31121	358	GET_DEGRADED \|
a9c2c6c6 PS	359	GET_COMPONENT\|
	360	GET_CHUNK\|
	361	GET_DEVS\|
	362	GET_OFFSET\|
	363	GET_SIZE);
	364
8d8ab389 PS	365	if(info == NULL) {
	366	fprintf(stderr, "%s: Error reading sysfs information of %s\n", prg, argv[1]);
	367	exit_err = 9;
	368	goto exitHere;
	369	}
	370
a9c2c6c6 PS	371	if(info->array.level != level) {
a9c2c6c6 PS	372	fprintf(stderr, "%s: %s not a RAID-6\n", prg, argv[1]);
af3c3750 PS	373	exit_err = 3;
af3c3750 PS	374	goto exitHere;
a9c2c6c6 PS	375	}
a9c2c6c6 PS	376
2cf31121 PS	377	if(info->array.failed_disks > 0) {
	378	fprintf(stderr, "%s: %s degraded array\n", prg, argv[1]);
	379	exit_err = 8;
	380	goto exitHere;
	381	}
	382
a9c2c6c6 PS	383	printf("layout: %d\n", info->array.layout);
a9c2c6c6 PS	384	printf("disks: %d\n", info->array.raid_disks);
af3c3750 PS	385	printf("component size: %llu\n", info->component_size * 512);
af3c3750 PS	386	printf("total stripes: %llu\n", (info->component_size * 512) / info->array.chunk_size);
a9c2c6c6 PS	387	printf("chunk size: %d\n", info->array.chunk_size);
	388	printf("\n");
	389
	390	comp = info->devs;
2cf31121	391	for(i = 0, active_disks = 0; active_disks < info->array.raid_disks; i++) {
a9c2c6c6	392	printf("disk: %d - offset: %llu - size: %llu - name: %s - slot: %d\n",
af3c3750	393	i, comp->data_offset * 512, comp->component_size * 512,
a9c2c6c6 PS	394	map_dev(comp->disk.major, comp->disk.minor, 0),
a9c2c6c6 PS	395	comp->disk.raid_disk);
2cf31121 PS	396	if(comp->disk.raid_disk >= 0)
2cf31121 PS	397	active_disks++;
a9c2c6c6 PS	398	comp = comp->next;
	399	}
	400	printf("\n");
	401
	402	close(mdfd);
	403
	404	raid_disks = info->array.raid_disks;
	405	chunk_size = info->array.chunk_size;
	406	layout = info->array.layout;
f2e29ad6 RB	407	if (strcmp(argv[2], "repair")==0) {
	408	if (argc < 6) {
	409	fprintf(stderr, "For repair mode, call %s md_device repair stripe failed_slot_1 failed_slot_2\n", prg);
	410	exit_err = 1;
	411	goto exitHere;
	412	}
	413	repair = 1;
	414	start = getnum(argv[3], &err);
	415	length = 1;
	416	failed_disk1 = getnum(argv[4], &err);
	417	failed_disk2 = getnum(argv[5], &err);
	418
b67e45b8	419	if(failed_disk1 >= info->array.raid_disks) {
f2e29ad6 RB	420	fprintf(stderr, "%s: failed_slot_1 index is higher than number of devices in raid\n", prg);
	421	exit_err = 4;
	422	goto exitHere;
	423	}
b67e45b8	424	if(failed_disk2 >= info->array.raid_disks) {
f2e29ad6 RB	425	fprintf(stderr, "%s: failed_slot_2 index is higher than number of devices in raid\n", prg);
	426	exit_err = 4;
	427	goto exitHere;
	428	}
	429	if(failed_disk1 == failed_disk2) {
	430	fprintf(stderr, "%s: failed_slot_1 and failed_slot_2 are the same\n", prg);
	431	exit_err = 4;
	432	goto exitHere;
	433	}
	434	}
	435	else {
	436	start = getnum(argv[2], &err);
	437	length = getnum(argv[3], &err);
	438	}
a9c2c6c6	439
979afcb8	440	if (err) {
a9c2c6c6	441	fprintf(stderr, "%s: Bad number: %s\n", prg, err);
af3c3750 PS	442	exit_err = 4;
af3c3750 PS	443	goto exitHere;
979afcb8	444	}
a9c2c6c6	445
af3c3750 PS	446	if(start > ((info->component_size * 512) / chunk_size)) {
	447	start = (info->component_size * 512) / chunk_size;
	448	fprintf(stderr, "%s: start beyond disks size\n", prg);
	449	}
a9c2c6c6	450
af3c3750 PS	451	if((length == 0) \|\|
	452	((length + start) > ((info->component_size * 512) / chunk_size))) {
	453	length = (info->component_size * 512) / chunk_size - start;
979afcb8	454	}
a9c2c6c6	455
503975b9 N	456	disk_name = xmalloc(raid_disks * sizeof(*disk_name));
	457	fds = xmalloc(raid_disks * sizeof(*fds));
	458	offsets = xcalloc(raid_disks, sizeof(*offsets));
	459	buf = xmalloc(raid_disks * chunk_size);
af3c3750	460
af3c3750 PS	461	for(i=0; i<raid_disks; i++) {
	462	fds[i] = -1;
	463	}
	464	close_flag = 1;
979afcb8	465
a9c2c6c6	466	comp = info->devs;
2cf31121	467	for (i=0, active_disks=0; active_disks<raid_disks; i++) {
a9c2c6c6	468	int disk_slot = comp->disk.raid_disk;
2cf31121 PS	469	if(disk_slot >= 0) {
	470	disk_name[disk_slot] = map_dev(comp->disk.major, comp->disk.minor, 0);
	471	offsets[disk_slot] = comp->data_offset * 512;
	472	fds[disk_slot] = open(disk_name[disk_slot], O_RDWR);
	473	if (fds[disk_slot] < 0) {
	474	perror(disk_name[disk_slot]);
	475	fprintf(stderr,"%s: cannot open %s\n", prg, disk_name[disk_slot]);
	476	exit_err = 6;
	477	goto exitHere;
	478	}
	479	active_disks++;
979afcb8	480	}
a9c2c6c6	481	comp = comp->next;
979afcb8 PS	482	}
979afcb8 PS	483
8d8ab389	484	int rv = check_stripes(info, fds, offsets,
979afcb8	485	raid_disks, chunk_size, level, layout,
f2e29ad6	486	start, length, disk_name, repair, failed_disk1, failed_disk2);
979afcb8 PS	487	if (rv != 0) {
979afcb8 PS	488	fprintf(stderr,
a9c2c6c6	489	"%s: check_stripes returned %d\n", prg, rv);
af3c3750 PS	490	exit_err = 7;
af3c3750 PS	491	goto exitHere;
979afcb8 PS	492	}
979afcb8 PS	493
af3c3750 PS	494	exitHere:
	495
	496	if (close_flag)
	497	for(i = 0; i < raid_disks; i++)
	498	close(fds[i]);
	499
a9c2c6c6	500	free(disk_name);
979afcb8 PS	501	free(fds);
	502	free(offsets);
	503	free(buf);
	504
af3c3750	505	exit(exit_err);
979afcb8	506	}